Rebar connector having a pair of locking pieces and connection method for prefabricated rebar net using same

Abstract

A rebar connector having a pair of locking pieces includes: a first rebar and a second rebar to be connected to each other; a first connecting member having a center hole, receiving the first rebar from a first side, having a first coupling hole at a second side, and having a threaded portion on the outer side; a second connecting member having a center hole, receiving the second rebar through a first side, and having a second coupling hole at a second side; a first locking piece coupled to the first coupling hole; a second locking piece coupled to the second coupling hole; and a locking socket locked at a predetermined position on the second connecting member, covering an outer side of the second connecting member, and having a female threaded portion on an inner side to be thread-fastened to the male threaded portion of the first connecting member.

1 . A rebar connector having a pair of locking pieces, the connector comprising:
 a first rebar and a second rebar to be connected to each other with ends fitted to each other;   a first connecting member having a center hole, receiving the first rebar into the center hole from a first side, having a first coupling hole at a second side, and having a male threaded portion at a predetermined section on an outer side thereof;   a second connecting member having a center hole, receiving the second rebar into the center hole through a first side, and having a second coupling hole at a second side;   a first locking piece separately formed and coupled to the first coupling hole;   a second locking piece separately formed and coupled to the second coupling hole; and   a locking socket locked at a predetermined position on the second connecting member, covering an outer side of the second connecting member, and having a female threaded portion on an inner side to be thread-fastened to the male threaded portion of the first connecting member,   wherein an integrated joint is formed by tightening the locking socket with the first locking piece and the second locking piece fitted to each other as a pair.   
     
     
         2 . The connector of  claim 1 , wherein the first locking piece and the second locking piece to be fitted to each other each have a body, a front end formed at a first end of the body, and a base end formed at a second end of the body, wherein the base end is inserted in the first coupling hole or the second coupling hole and the front ends are fitted to each other. 
     
     
         3 . The connector of  claim 2 , wherein the first coupling hole and the second coupling hole respectively have a first space and a second space for absorbing displacement of the first connecting member and the second connecting member when the locking socket is tightened. 
     
     
         4 . The connector of  claim 3 , wherein the first space and the second space communicate with the center holes, and sizes of the first space and the second space depend on a coupling length of the first and second connecting members and the first and second rebars. 
     
     
         5 . The connector of  claim 2 , wherein front ends of the first locking pieces and the second locking pieces to be fitted to each other are flat surfaces perpendicular to an axial direction, or are a projection and a recession corresponding to the projection, respectively. 
     
     
         6 . The connector of  claim 5 , wherein the projection at the front end and the recession corresponding to the projection are
 multi-stepped inclined projection having a one or more of uniform sections and inclined sections longitudinally formed on an outer side and a recession corresponding to the multi-stepped inclined projection, or   a multi-stepped rectangular projection having a one or more of uniform sections and inclined sections longitudinally formed on an outer side and having an end being parallel with an axial direction, and a recession corresponding to the multi-stepped rectangular projection, or   a multi-stepped curved projection having a one or more of uniform sections and inclined sections longitudinally formed on an outer side and having a rounded end, and a recession corresponding to the multi-stepped curved projection, or   a projection having a shape selected from shapes of a cone, a frustum-cone, a cone with a rounded top, a cylinder, a polypyramid, a frustum-polyprism, a polyprism with a rounded top, a polygonal cylinder, a sphere, an elliptical sphere, a frustum-spherical shape, a frustum-elliptical sphere, a triangle, a triangle with a rounded top, a rectangle, and a rectangle with rounded edges, and a shape having an end on which a cross, a combination of a cross and a circle, or a waved colgate is formed, and a recession corresponding to the projection.   
     
     
         7 . The connector of  claim 5 , wherein the recession is an axially formed through-hole. 
     
     
         8 . The connector of  claim 3 , wherein the base ends of the first locking piece and the second locking piece are inserted in the first coupling hole and the second coupling hole and loosely positioned in the first space and the second space. 
     
     
         9 . The connector of  claim 6 , wherein a second projection is formed on the bodies of the first locking piece or the second locking piece outward from the first space and the second space to limit an insertion depth of the first locking piece or the second locking piece, and is spaced from front ends of the first connecting member and the second connecting member to define a first gap and a second gap that adjust a length of the joint or remove initial slip. 
     
     
         10 . The connector of  claim 9 , wherein a step for locking the first projections at the base ends of the first locking piece and the second locking piece is formed inside the first space and the second space, and is one or more bolts. 
     
     
         11 . The connector of  claim 9 , wherein the loosely positioned base ends of the first locking piece and the second locking piece are pressed at predetermined positions by front ends of the first rebar and the second rebar. 
     
     
         12 . The connector of  claim 9 , wherein the base ends of the first locking piece and the second locking piece are inserted in the center holes of the first connecting member and the second connecting member and pressed by front ends of the first rebar and the second rebar to be fitted to the first space and second space and the front ends of the first rebar and the second rebar. 
     
     
         13 . The connector of  claim 12 , wherein first female threads are formed on inner sides of inlets of the first space and the second space, first male threads are formed at a predetermined section on outer sides of the first locking piece and the second locking piece, and the first male threads are inserted and thread-fastened in the inlets. 
     
     
         14 . The connector of  claim 13 , wherein the first locking piece and the second locking piece are pressed between the first female threads on the inner sides of the inlets and the front ends of the first rebar and the second rebar. 
     
     
         15 . The connector of  claim 12 , wherein the inner sides of the inlets of the first space and the second space and the base ends of the first locking piece and the second locking piece each have a tolerance, and the base ends of the first locking piece and the second locking piece are forcibly fitted in the inlets. 
     
     
         16 . The connector of  claim 15 , wherein a mark for showing a primary insertion position is formed at a predetermined position on the base ends of the first locking piece and the second locking piece. 
     
     
         17 . The connector of  claim 15 , wherein prominences and depressions are formed on the inner side of the inlet of the first space or the second space. 
     
     
         18 . The connector of  claim 9 , wherein torque that is applied to tighten the locking socket changes a circumferential position of the locking socket and moves the first connecting member and the second connecting member to each other, displacement of the first connecting member and the second connecting member is absorbed by the first gap and the second gap, and the joint is formed with initial slip absorbed by the first gap and the second gap, thereby preventing initial slip of the joint. 
     
     
         19 . The connector of  claim 1 , wherein the first locking piece and the second locking piece align axes of the first rebar and the second rebar and prevent initial slip of the first rebar and the second rebar in the joint. 
     
     
         20 . The connector of  claim 1 , wherein the first rebar and the second rebar are threaded rebars, and female threaded portions for coupling the threaded rebars are formed in the center holes of the first connecting member and the second connecting member, respectively. 
     
     
         21 . The connector of  claim 1 , wherein a female threaded portion for coupling a connecting member is formed in the center holes of the first connecting member and the second connecting member, the first rebar and the second rebar are deformed steel bars, and the male threaded portion for coupling a connecting member is formed by any one of forming set threads through form rolling after swaging at the end of the deformed steel bar, forming cut threads through cutting, or attaching a threaded connection member that is separately formed. 
     
     
         22 . The connector of  claim 1 , wherein a first locking step having one or more steps is formed at the predetermined position on the second connecting member where the locking socket is locked, a second locking step having one or more steps to be locked to the first locking step is formed on the inner side of the locking socket, and the steps having one or more steps are formed with an acute angle, a right angle, or an obtuse angle, or are curved with a predetermined curvature. 
     
     
         23 . The connector of  claim 1 , wherein a portion for preventing slide and allowing for easily holding with a hand is formed on the outer sides of the first connecting member, the second connecting member, and the locking socket, and the portion for preventing slide includes any one of cases when a spline is formed on the outer sides, the outer sides are knurled, the cross-sections are formed in a circle, the cross-section is formed in a polygon, a holding surface is formed at one or more positions facing each other. 
     
     
         24 . The connector of  claim 1 , wherein the male threaded portion, the female threaded portion, the first female threads, the male threads, the male threaded portion for coupling a connecting member, and the female threaded portion for coupling a connecting member are composed of one or more threads, the threads have a cross-sectional shape of any one of triangle, a rectangle, an ellipse, and a circle, the threads have any one of a first class, a second class, and a third class, pitches of the threads are a pitch of a thin thread or a common thread, and the threads are left-hand threads or right-hand threads. 
     
     
         25 . The connector of  claim 1 , wherein the first rebar and the second rebar are different in size. 
     
     
         26 . A method of connecting prefabricated rebar nets using the rebar connector having a pair of locking pieces of  claim 1 , the method comprising:
 coupling the first connecting member and the second connecting member to a first prefabricated rebar net and a second prefabricated rebar net;   fitting the locking pieces on the prefabricated rebar nets to each other by lifting and placing the first prefabricated rebar net onto the second prefabricated rebar net; and   correcting inclination of the first prefabricated rebar net by changing a position of the first connecting member or the second connecting member,   thereby connecting the prefabricated rebar nets while correcting inclination of one of the prefabricated rebar nets.   
     
     
         27 . A method of connecting prefabricated rebar nets using the rebar connector of  claim 1 , the method comprising:
 coupling the second locking pieces and the second connecting members to a lower prefabricated rebar net that is fixed, coupling the first locking pieces and the first connecting members to an upper prefabricated rebar net, and lifting and placing down the upper prefabricated rebar net with the first locking pieces and the first connecting members, which are coupled to a end of one or more rebars selected in a same cross-section of the upper prefabricated rebar net, having different lengths;   fitting the first locking pieces coupled to the ends of the rebars selected in cross-section of the upper prefabricated rebar net;   securing verticality by correcting inclination of the upper prefabricated rebar net by changing the positions of the first connecting members coupled to the fitted first locking pieces;   fixing positions of the first connecting members by tightening locking sockets after securing the verticality;   fitting the locking pieces coupled to the other rebars by turning down the first connecting members at the ends of the other rebars while maintaining the verticality; and   fixing positions of the first connecting members turned down at the ends of the other rebar by tightening locking sockets,   thereby connecting the prefabricated rebar nets while correcting inclination of one of the prefabricated rebar nets.   
     
     
         28 . The method of  claim 27 , wherein the rebars selected in the cross-section of the upper prefabricated rebar net are any one of:
 reference rebars disposed at four corners and arranged in an X-shape or a +-shape when the cross-section of the upper prefabricated rebar net is a rectangle;   reference rebars disposed at corners when the cross-section of the upper prefabricated rebar net is a polygon except for a rectangle; and   reference rebars disposed at quadrantal positions when the cross-section of the upper prefabricated rebar net is a circle.